如何将数据从JS发送到Bash？

I need to process some dynamic data on a webpage using client side JS code only. Then I would like to run a program in my local computer's terminal on the result. The result has simple structure that is trivial to this question. Low cpu usage and latency is required. So I cannot write my result to a mysql database and use shell to keep polling the update.I need to process some dynamic data on a webpag